Shoe cementing press



Get. 6, 1953 Filed iJune 2, 1949 M. c. SUERKEN SHOE CEMENTING PRESS- 4 Sheets-Sheet l 4 4 Inventor attorney Oct. 6, 1-953 M. c. SUERKEN 2,654,104

.SHOE CEMENTING PRESS Filed June 2, 1949 4- Sheqts-Sheet 2 Zmmntor wmltdcx-u a Oct. 6, 1953 v M. c. SUERKEN 2,654,104

suor: CEHENTING PRESS V Filed June 2, 1949 4 Sheets-Sheet 3 I Snocntor Patented Oct. 6, 1953 SHOE YCEMENTING PRESS Maxwell C. Suerken, Erie, Pa., assignor to Lamac Process Company, Erie, Pa., a corporation of Delaware Application June 2, 1949, Serial No. 96,709

2 Claims.

Shoe pressing machines are commonly provided with a cushion pad for receiving a shoe and a pressure mechanism for exerting pressure on a sole to be attached. The sole is treated with cement and is attached to the shoe through the pressure exerted by the machine.

The present invention is intended to improve the safety of the machine by a construction in which the cementing pressure is developed after the press has been closed by the operator, and in which the cementing pressure is utilizedto hold the press in the closed position. Further objects and advantages appear in the specification and claims.

In the drawings, Fig. l is a side elevation substantially in section on line of Fig. 3 of a shoe cementing press in the closed position; Fig. 2 is a side elevation of the press in the opened position; Fig. 3 is a front elevation of the press; Fig. 4 is a detail of the latch mechanism holding the control valve in the pressure position; and Fig. 5 is a detail of the valve.

The invention is shown applied to a two unit press having two identical press units mounted side by side on a frame I. Each of the press units comprises a lower frame 2 having its base 3 suitably fixed to the top 4 of the frame I and a pressure arm 5 pivoted at 6 on the lower frame 2. As shown in Fig. 2 the pressure arm 5 is normally held in a raised position by a tension spring 6a attached to a bell crank lever pivoted at 8 on the lower frame 2. The bell crank lever has an arm 9 pivoted to a link I carried by a depending arm I I on the pressure arm. The links 9 and I3 serve as a toggle lever for moving the pressure arm between the opened and closed positions. In the closed position the arm 9 strikes an adjustable stop |2 which is'adjusted so that the common pivot |3 of the toggle lever is slightly above the center line of the toggle linkage. When the toggle lever is in the position shown in Fig. 2 the pressure arm 5 is raised and heel and toe pressure members l4 and I 5 are sufficiently above a pressure pad l6 to permit convenient insertion and removal of a shoe I! and a last l8 and having a sole l9 which is to be cemented. This gives the operator space to load and unload the press. The heel and toe pressure members are adjustable both lengthwise and up and down of the pressure arm 5. pressure members is carried at the lower end of an adjusting screw 20 threaded in a sleeve 2| slideably received between side walls 22 of the pressure arm 5. The sleeve 2| has a flange 24 which engages the under edges of the side walls Each of the 22. The sleeve 2| is freely slideable in the pressure arm and is held in adjusted position by a washer 25 which-rides on the upper edges of the side walls 22 and is adjustably held against these edges with sufiicient pressure to produce the desired friction by compression springs 26 arranged on bolts 21 extending through the friction washer 25 and through a guide flange 28 at the upper end of the sleeve 2|. The guide flange 28 is elongated so that it rides between the side walls 22 and holds the sleeve 2| against turning. The strength of the springs 26 i such that the sleeve 2| will remain in position and yet may be readily moved so as to accommodate different shoe sizes.

The pressure pad I6 is carried in a box shaped base 28a having side and end walls 29 and3l surrounding the edges of the pad. Within the base is a fixed sole plate 3| and a pivoted heel and arch plate 3| a which is adjustable by means of a screw 32 to accommodate different types of shoes. The base 28a is suitably secured to th base 3 of the frame 2.

The press is closed by a foot pedal 46 pivoted at 46a on the frame I. The inner end of the foot pedal is connected by a link 46b to a plunger 41 carried in suitable guides 48, 49, and having a head 50 engageable with a roller 5| on the common pivot |3 of the toggle lever links 3 and I0. Upon depressing the foot pedal 46 the plunger 41 is raised to the position shown in Fig. 1 in which the common pivot 3 of the toggle lever is slightly above the center line of the toggle links Sand H]. In this position the pressure arm 5 is moved downward so that the heel and toe pressure members l4 and |5 make contact with the shoe II. On the plunger 41 is a bracket 52 adjustably carrying a rod 52a which in the raised position ofthe plunger engages the lower end of a valve operating rod 53 slideably carried in an extension 54 of the guide 49 on the frame I. The valve operating'rod 53 is biased downward by a spring 55 which normally holds the rod 53 in the position shown in Fig. 5 in which the chamfered end 56 contacts a roller 51 on a valve plunger 58 of a three way valve of the type in which the plunger 58 is biased to the venting position. In

o the shoe. At this point the press is closed but no pressure is developed since the pad is vented to the atmosphere through the conduit 60 and the vent port 59. A slight additional depression of the foot pedal raises the valve operating rod 53 and the chamfered end 56 cams the valve operating plunger 58 to the left as viewed in Fig. 5. This closes the vent port 59 and connects an air pressure line 6| to the conduit 60 thereby establishing the full cementing pressure in the pad. Since at this time the common pivot [3 of the toggle lever is above dead center the shoe cementing pressure tends to hold the toggle in the set position illustrated in Fig. 1. The valve is latched in the pressure position by a latch 53 pivoted at 64 on the bracket 54. The bracket 54 has a depending section 65 in the lower end of which is pivoted a shaft 65 fixed to a triangular latch trip plate 61 (Fig. 4). Along the upper edge of the latch trip plate 61 is a flange 68 through which extend latch trip rods i. The rods 55 are biased upward by coil springs 18 arranged between the upper side of the flange 68 and a washer II on the rods. As the plunger 41 is raised by the foot pedal 46 a fiat surface .12 on the bracket 51 comes into contact with a roller 13 at the adjacent corner of the triangular latch trip plate .61. This tilts the latch trip plate to the position shown in Fig. 4 in which the :rod 69 at the uppermost corner of the plate is moved upward pivoting the associated latch 53 about its pivot 54 and holding the valve operating rod 53 in the pressure position. When the foot pedal is released and the plunger 41 drops by gravity, the flat surface 12 moves down below the roller 13. The rod 53 however, is latched in the pressure position so that the cementing pressure remains. The cementing pressure may be released by turning the shaft 55 in a clockwise direction as viewed in Fig. 4. This moves the triangular latch plate 51 from the inclined or tilted position shown to a position in which the rod 69 at the right in Fig. 4 is pulled downward to release the associated latch 53. The spring 55 then moves the rod 53 downward and closes the connection to the air pressure line GI and opens the vent 59 as illustrated in Fig. 5. Of course the latch "3 cannot be tripped until the plunger 41 has dropped to its lowered position. This does not inconvenience the operator because the foot pedal is never depressed longer than necessary to initially close the press and admit the air pressure to the pad. For convenience the shaft 56 is provided with a handle 15 so that the press can always be manually tripped.

Upon tripping of the latch 63 the air pressure within the pad is immediately vented through the vent port 55. As soon as the air within the pad is released to a point at which the spring 6a can move the toggle to the opened position against the air pressure still remaining within the pad, the press is immediately opened. Since the press is held in the closed position solely by the air pressure, the release of the air pressure for any reason results in an opening of the press. This opening takes place only after the pressure has been released. There is no need for any sequential control of the opening of the press and the release of the pressure.

So far only one of the two cementing presses has been described. These presses are arranged side by side as indicated in Fig. 3 and each has identical parts which are indicated by corresponding reference numerals. There is for each of the presses a valve controlling the admission of air to and exhaust of air from its pad. Each of the presses has its own foot pedal. When one of the foot pedals is depressed the latch trip member 51 is tilted to a position in which the latch 63 associated with the depressed foot pedal can be moved to the latching position so as to hold the air pressure valve in the pressure position. When the latch trip rods are adjusted as illustrated in Fig.4 the tilting of the latch plate member 51 in a direction to permit the latching of one of the valves in the pressure position causes a movement of the adjacent latch memher to the release or vent position. This means that the application -of pressure to one of the two presses starts the release of pressure in the adjacent press. This is desirable as ordinarily the operator removes the cemented shoe from one press and replaces it with another shoe to be cemented while the cementing operation is being completed in the adjacent press. While the above sequence of operntim is usrnlly desirable, it is not necessary that the presses be adjusted so that the application of pressure to one of the presses effects the release of pressure in the adjacent press. 'By unthreading nuts 15 at the lower end of the latch trip rods 65 the rods can be adjusted so that a greater tilting of the latch trip plate 67 than is illustrated in Fig. 4 is required to trip the latches 51. Under this adjustmcnt the release of pressure in the presses is solely under the control of the handle 15.

Because each of the presses is a. self contained unit in which the shoe cementing pressure is confined to the frame 2 and the measure arm 5 it is unnecessary that the presses remain fixed or mounted on the frame I. The frame I merely provides one manner of supporting the presses. Any number of presses may be mounted on a turntable or conveyor as is customary. Once the pressure has been applied to one of the presses the pressure will remain until the air pressure in its pad is vented. The continued application of pressure in no way depends upon the frame i or the treadle or trip medium but is solely dependent upon the air pressure in the pad since the air pressure in the bag forces the pressure arm up and the arm H to the right, and since the common pivot 13 is above center, the arm 5 is held against the stop It.

Intheuse ofthepresashoc withasoletobe cemented is placed upon the pad 15 and the heel and toe pressure members l4 and 15 are adjusted to fit the size shoe being cemmted. The operator then depresses the foot pedal 46 lowering the pressure arm 5 and bringing the heel and toe pressure members 14 and 15 into contact with the shoe. At this point there is no cementing pressure. The operator can open and reclose the press if desired by raising and lowering the foot pedal. After the initial closing of the press. operator can notice a definite additional resistance to further depression of the foot pedal which indicates that the rod 52 has been brought into contact with the valve operating rod 53. A slight additional downward movement of the foot pedal 45 raises the valve operating rod 53 and cams the valve plunger 58 to the pressure position where it is latched by the associated latch 63. This connects the air pressure line to the bladder 34 and inflates the pad to the desired shoe cementing pressure. Because the toggle lever 9, I0 is in the set position prior to the opening of the air pressure line the pressure developed in the pad holds the press in the closed position. The pressure can be released manually by moving the handle 15 toward the press. This releases the latch 63 and permits the return of the valve to the position illustrated in Fig. in which the pad is vented to the atmosphere through the vent port 69. The release of pressure in the pad permits the opening of the press by the spring 611 as soon as the pad pressure has decreased to a point at which the pad pressure can be overcome by the spring 6a. Both the holding of the press in. the closed and pressure position and the opening of the press are accordingly controlled by or responsive to the air pressure in the pad.

Instead of opening the press by means of the handle the operator can in the case of the two unit press effect the opening of one of the presses by the closing of the other press as described above.

The operator can release the pressure at any time. Before the air pressure is applied, the operator merely releases the foot pedal. After the pad is inflated, the pressure is releasable by the trip lever 15.

What I claim as new is:

1. In a shoe press, co-operating press members, one of which comprises a frame carrying an inflatable pad and the other an arm pivoted on the frame intermediate its end and carrying on one end a pressure member engaging a shoe on the pad, a toggle for opening and closing the press comprising links pivoted respectively to the frame and to the other end of the arm and pivoted to each other at the knee of the toggle, the toggle being movable to a released position in which the press is open and the knee of the toggle is on one side of the center line of the toggle and a set position in which the press is closed and the knee of the toggle is on the other side of the center line of the toggle, a stop limiting movement of the toggle past the set position. a manual control for moving the toggle to the set or closed position, said control including a plunger co-operating with the knee of the toggle to move it to the closed or set position and being disconnected from the toggle and biased away from the closed position, said press in the closed position developing no cementing pressure, an air pressure line, a three way valve having a way connected to the pad, a way connected to the air pressure line, and a way connected to a vent, said valve being movable to a venting position with the way to the line closed and the way to the vent open and to an inflating position with the way to the vent closed and the way to the line open, valve operating means responsive to movement of the manual control to the closed position trol, means for holding the valve operating means in the inflating position independent of the manual control, means biasing the toggle away from the set position with suflicient force to return the toggle to the released position in the absence of inflating pressure but not in the presence of inflating pressure, and. a control for effecting movement of the valve operating means to the venting position to open the press upon venting of the inflating pressure.

2. In a shoe press of the type having co-operating press members, one of which comprises an inflatable pad, and mechanism for closing the press, a manual control for actuating the mechanism to the extent necessary to close the press without cementing pressure, a fluid pressure line, a three way valve having a way connected to the pad, a way connected to the line, and a way connected to a vent, said valve having operating means movable to a venting position with the way to the line closed and the way to the vent open and to an inflating position with the way to the vent closed and the way to the line open, a control for the valve operating means connected with the manual control and responsive to further closing movement of the manual control after the closing of the press without eementing pressure for moving the valve operating means to the inflating position, means for holding the valve operating means in the pad inflating position independent of the manual control, said mechanism for closing the press being responsive to the inflated pressure to develop a biasing force acting on the press mechanism to hold it closed, means connected to the press mechanism and biasing the press mechanism to the open position with a force sufficient to open the press in the absence of inflating pressure but not in the presence of inflating pressure, and a control for effecting movement of the valve operating means to the venting position to vent the inflating pressure so the press can be opened by the biasing means.

MAXWELL C. SUERKEN.

References Cited in the flle of this patent UNITED STATES PATENTS Number Name Date 2,080,036 Finn May 11, 1937 I 2,095,424 Turner Oct. 12, 1937 2,095,658 Card, Jr. Oct. 12, 1937 2,149,391 Finn Mar. 7, 1939 2,301,205 Finn Nov. 10, 1942 2,420,972 Perri May 20, 1947 2,422,390 Brauner June '17, 1947 FOREIGN PATENTS Number Country Date 470,097 Germany Jan. 4, 1929 

